Electrical heating unit



E. KUHN AND F. E. SHAILOR.

ELECTRICAL HEATING UNIT.

APPLICATION FILED SEPT. 9. 1915.

1,310,994, 4.PIIIIII'IIl July 22, 1919.

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UNITED sTATEs PATENT oEEIoE.

FRANK KUHN AND FRANK E. SHAILCR, OF DETROIT, MICHIGAN, ASSIGNORS T0AMERICAN ELECTRICAL HEATER COMPANY, OF DETROIT, MICHIGAN, A COR-PORATION 0F MICHIGAN.

ELECTRICAL HEATING- UNIT.

Application led September 9, 1915.

To all whom t may concern.'

Be itknown that we, FRANK KUHN and FRANK E. SHAILOR, citizens of theUnited States of America, residing at Detroit, in the county of Wayneand State of Michigan, 'have invented certain new and usefulImprovements in Electrical Heatmg Unlts, of which the following is aspecification, reference being had therein to the accompanying drawings.

The invention relates to electrical heating units of that type in whichthe heat is distributed by radiation from a naked resistor. It istheobject of thel invention to employ a continuous resistor and at thesame time to concentrate the radiation at a plurality of pointsdistributed over an area. To this end the invention comprises theconstruction as hereinafter set forth.

ln the drawings:

Figure l is an elevation of a portion of the unit;

Fig. 2 is a longitudinal section thereof;

Fig. 3 is a perspective view of the resistor; and

Figs. 4 and 5 are perspective views of the complementary insulatormembers on which the resistor is mounted.

A. is a resistor of any suitable length. B B etc. are coiled portionsofthe resistor, each comprising a plurality of convolutions, preferablyforming a cone. The portion' C leading from the top convolution passesdownward through the center of the coil and then laterally at D to thenext adjacent coil. E are insulators formed of refractory material, suchas porcelain, and which have a conical portion F for receiving theconical coil. This conical portion is slitted at G on one side thereoffor the insertion of the portion C of the coil, and at the base of thecone is a flange portion H which has slots l for receiving the lateralportions of the resistor. .l is an insulator ring for fitting around thecone F and against the base flange H. This ring J has aprojectingportion K of reduced diameter for fitting into an apertured holder plateL, and the member E is also provided with a portion M cf reduceddiameter for fitting into an apertured holder plate hl.

With the construction as described to assemble the unit, the coils B Betc. are engaged with a series of members E, and the Specification ofLetters Patent.

Patented July 22, 1919.

seria1N0.49,725. l

members J are then placed inengagement therewith, as shown in Fig. 2.The pairs of members are then placed between the parallel holder platesL and N, while the intermediate connecting portions of the resistor arehoused between said plates, being spaced therefrom and out of electricalcontact. lVhen the current is passed through the resistor, each of thecoils will form a glowing point of radiation, and byreason of theengagement of the'members E and J displacement is prevented.

lVhat we claim as our invention is l. An electrical heating unit,comprisinga continuous resistor having a series of spaced convolutedportions and insulators formed of complementary sections engaging eachof said convoluted portions directly and clamping the same in position.

f2. An electrical heating unit, comprising a continuous resistor havinga series of convoluted portions, Aand insulators for supporting saidconvoluted portions, comprising a conical base portion and a clampingring.

3. An electrical heating unit,` comprising a resistor having conicaltions with the terminal portion extending through the axis of theconvolutions, and an insulator having a portion for fitting within' saidconvolutions slitted minal portion.

4. An electrical heating unit, comprising a resistor having a conicalconvoluted ortion with a portion extending axially o the convolutions,an insulator having a conical portion for engaging said convolutedVportion slitted to receive said axial portion, and

to receive said teran insulator ring surrounding said conical' portionand clamping said resistor thereon.

5. An electrical heating unit, comprising a resistor having a convolutedportion with a terminal portion extending through the convoluted portionand spaced from the convolutions thereof, and an insulator having aportion fitting within said convolutions, slitted to receive saidterminal portion.

6. An electrical heating unit, comprisinga resistorhaving a series ofconvoluted portions, insulators for supporting said convolated;portions, comprising a base portion tting within the coil and a clampingring, and spaced members for holding the clamping ring upon the baseportion, one of said convoluted por-` spaced members being apertured forthe reception of one of the insulators.

7 An electrical heating unit, comprising a resistor having aconvolutedportion with a terminal portion extending through theconvoluted portion and spaced from the con- Volutions thereof, aninsulator having a portion fitting Within said convolutions slitted toreceive said terminal portion, an -insu- 10 lator ringsurrounding saidportion tting within the convolutions and clamping said resistorthereon, and spaced members clamping said insulator parts to each other.

ln testimony whereof We aiiX our signatures in 'presence of twoWitnesses. FRANK KUHN.

FRANK E. SHAILOR. Witnesses:

HARRY W. LUYGK, JAMES E. DUFFEY.

